feat(seo): improve SEO configuration and enable SSR

- Enable `ssr: true` in `nuxt.config.ts` for server-side rendering of meta tags.
- Implement `useSeoMeta` in `events/.vue` with fallback logic for Open Graph and Twitter cards.
- Update `content.config.ts` to use `asSeoCollection` for the news collection.
- Migrate event markdown frontmatter to use standardized SEO fields.

nuxt.config.ts

@@ -5,14 +5,15 @@ export default defineNuxtConfig({
   compatibilityDate: "2025-07-15",
   devtools: { enabled: true },
   modules: [
-    "@nuxtjs/seo",
     "@nuxt/ui",
+    "@nuxtjs/seo",
     "@nuxt/content",
     "@nuxt/image",
     "reka-ui/nuxt",
     "@nuxtjs/robots",
     "@nuxtjs/sitemap",
   ],
+  ssr: true,
   css: ["~/assets/css/main.css"],
   vite: {
     plugins: [tailwindcss()],